<template>
    <div>
      <!--面包屑导航区域-->
      <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>商品分类</el-breadcrumb-item>
      </el-breadcrumb>
      <!--卡片视图区域-->
      <el-card>
        <el-row>
          <el-col>
            <el-button type="primary" @click="showAddCateDIalog">添加分类</el-button>
          </el-col>
        </el-row>
        <!--表格-->
        <tree-table :data="catelist"
        :columns="columns"
        :selection-type="false"
        :expand-type="false"
        show-index
        index-text="#"
        border
        :show-row-hover="false"
        class="treeTable">
          <template slot="isok" slot-scope="scope">
            <i class="el-icon-success" v-if="scope.row.cat_deleted === false"
            style="color:lightgreen"></i>
            <i class="el-icon-error" v-if="scope.row.cat_deleted === true"
               style="red"></i>
          </template>
          <template slot="order" slot-scope="scope">
            <el-tag size="mini" v-if="scope.row.cat_level===0">一级</el-tag>
            <el-tag size="mini" v-else-if="scope.row.cat_level===1" type="success">二级</el-tag>
            <el-tag size="mini" v-else-if="scope.row.cat_level===2" type="warning">三级</el-tag>
          </template>
          <template slot="opt" slot-scope="scope">
            <el-button type="primary" icon="el-icon-edit" size="mini">编辑</el-button>
            <el-button type="danger" icon="el-icon-delete" size="mini">删除</el-button>
          </template>
        </tree-table>

        <!--分页区域-->
        <el-pagination
          @size-change="handleSizeChange"
          @current-change="handleCurrentChange"
          :current-page="queryInfo.pagenum"
          :page-sizes="[3,5,10,15]"
          :page-size="queryInfo.pagesize"
          layout="total, sizes, prev, pager, next, jumper"
          :total="total">
        </el-pagination>
      </el-card>
      <!--添加分类的对话框-->
      <el-dialog
        title="添加分类"
        :visible.sync="addCateDialogVisible"
        width="50%"
        @close="addCateDialogClosed">
        <!--添加分类的表单-->
        <el-form :model="addCateForm" :rules="addCateFormRules" ref="addCateFormRef" label-width="100px">
          <el-form-item label="分类名称：" prop="cat_name">
            <el-input v-model="addCateForm.cat_name"></el-input>
          </el-form-item>
          <el-form-item label="父级分类：" prop="name">
            <el-cascader
              v-model="selectedKeys"
              :options="parentCateList"
              expandTrigger="hover"
              :props="cascaderProps"
              @change="parentCateChanged"
              clearable
              change-on-select></el-cascader>
          </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
          <el-button @click="addCateDialogVisible = false">取 消</el-button>
          <el-button type="primary" @click="addCate">确 定</el-button>
        </span>
       </el-dialog>
    </div>
</template>

<script>
import request from 'api/request'

export default {
  name: 'Cate',
  data () {
    return {
      // 查询条件
      queryInfo: {
        pagenum: 1,
        type: 3,
        pagesize: 5
      },
      // 商品分类的数据列表，默认为空
      catelist: [],
      // 总数据参数
      total: 0,
      // 为table指定列的定义
      columns: [
        {
          label: '分类名称',
          prop: 'cat_name'
        },
        {
          label: '是否有效',
          type: 'template',
          template: 'isok'
        },
        {
          label: '排序',
          type: 'template',
          template: 'order'
        },
        {
          label: '操作',
          type: 'template',
          template: 'opt'
        }
      ],
      addCateDialogVisible: false,
      // 添加分类的表单数据对象
      addCateForm: {
        cat_name: '',
        cat_pid: 0,
        cat_level: 0
      },
      addCateFormRules: {
        cat_name: [
          {required: true, message: '请输入分类名称', trigger: 'blur'},
        ]
      },
      // 父级分类的列表
      parentCateList: [],
      // 指定级联选择器的配置对象
      cascaderProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      // 选中父级分类的id数组
      selectedKeys: []
    }
  },
  created () {
    this.getCateList()
  },
  methods: {
    // 获取商品分类数据
    async getCateList () {
      const {data: res} = await request('categories',this.queryInfo)
      if(res.meta.status !== 200) {
        return this.$message.error('获取商品分类失败！')
      }
      this.catelist = res.data.result
      this.total = res.data.total
      this.$message.success('获取商品分类成功！')
    },
    // 监听pagesize改变
    handleSizeChange (newSize) {
      this.queryInfo.pagesize = newSize
      this.getCateList()
    },
    // 监听pagenum改变
    handleCurrentChange (newPage) {
      this.queryInfo.pagenum = newPage
      this.getCateList()
    },
    // 点击按钮展示添加分类的对话框
    showAddCateDIalog () {
      this.getParentCateList()
      this.addCateDialogVisible = true
    },
    // 获取父级分类的数据列表
    async getParentCateList () {
      const {data:res} = await request('categories',{type:2})
      if(res.meta.status !== 200) {
        return this.$message.error('获取父级分类列表失败！')
      }
      this.parentCateList = res.data
    },
    // 选择项发生变化触发这个函数
    parentCateChanged () {
      if(this.selectedKeys.length > 0){
        this.addCateForm.cat_pid = this.selectedKeys[this.selectedKeys.length - 1]
        this.addCateForm.cat_level = this.selectedKeys.length
        return
      } else {
        this.addCateForm.cat_pid = 0
        this.addCateForm.cat_level = 0
      }
    },
    // 点击按钮添加新的分类
    async addCate () {
      this.$refs.addCateFormRef.validate(valid => {
        if(!valid) return
      })
      const {data:res} = await request('categories',this.addCateForm,'post')
      if(res.meta.status !== 201) {
        return this.$message.error('添加分类失败！')
      }
      this.$message.success('添加分类成功！')
      this.getCateList()
      this.addCateDialogVisible = false

    },
    addCateDialogClosed () {
      this.$refs.addCateFormRef.resetFields()
      this.selectedKeys = []
      this.addCateForm.cat_level = 0
      this.addCateForm.cat_pid = 0
    }
  }
}
</script>

<style scoped>
  .treeTable {
    margin-top: 15px;
  }
  .el-cascader {
    width: 100%;
  }
</style>
